Marijuana Vegetative Stage
The Vegetative Growth Stage of Cannabis Plants
This chapter assumes that you have germinated your seeds and now have little marijuana seedlings starting to grow. If you took our advice and have some nutrients in the soil (or water), then this stage can be a fairly easy stage to get through.
Temperature & Humidity: Room temperature should stay between 72 - 85 degrees Fahrenheit. Yes, I could say 78 is ideal, but if you can retain your room temperature in this range, you should be fine. Sometimes, being exact will drive you nuts, and sometimes you NEED to be exact.
Your humidity is good if 45 - 65 percent can be maintained in your vegetative grow room. Oh, and yes, your room can get to 60-65 degrees Fahrenheit at night (lights out) without any problems.
Lights: Your lights should now be ON for 16 to 20 hours per day (24 hour period) - Light timers or outlet timers control this for you. When your lights come on we'll call this dawn (4:00 a.m. or whatever) - remember this for later.
Watering: You should only water your marijuana plants when they are dry... not damp, let the top of the surface actually get crusty dry.
Be sure to let your plants get dry before watering again. Besides appearance, you can "lift" the plant and check it's weight. When really light - you know the plant is dry.
Air Circulation: Be sure to keep fresh air moving through your grow room. This is critical in keeping healthy plants. This also helps you keep a stable temperature and humidity level.
Be sure you have an exit area for air to escape and replenish the room (even at night).
Do not blow constant wind on any plants, keep it moving, not blowing ON the plants.
Vegetative Stage Nutrients: There are 3 main components to plant fertilizers; Nitrogen (N), Phosphorous (P), and Potassium (K). Depending on what stage of growth your marijuana is in, determines the nutrients. If you use in-water nutrients, be careful of how much and how often... reading the label could help prevent harm to your plants. I only water nutrients every-other watering.
During this vegetative stage of growth your plants will like a few things like Nitrogen. If you have used a potting soil with nutrients or plant food enhanced soil, then it probably has a good concentrate of Nitrogen already. See our Grow Tips for more custom soil information and ingredients.
This Hawaiian marijuana plant is ready to move into flowering. It is vibrant, green, strong, multi-branched, and about 20" inches tall. Do not let the size fool you, (without pruning) it will be well over 7 feet before it finishes flowering!
Stage Duration: It is recommended that you allow your plants to get in a number of weeks of strong vegetative growth. Your plant should be 18" inches or taller, and have at least 4-6 leaf branches before moving them into the flowering stage.
Some plant types (strains) take longer periods to attain the same height or leaf levels, it helps the plant to be strong before leaving the vegetative stage. We want plentiful and potent buds, most seeds have recommended terms listed for the strains purchased. You are controlling this plants "summertime" right now, keep this in mind and it may help.
When you grow indoors it is sometimes preferable to prune or trim your plant before it reaches these heights... some marijuana plants can easily exceed 8 feet at peak (there are ways to control this indoors too).
SEX: Don't worry yet - You may not know or be able to tell yet what sex your plant is... (unless you bought female seeds or you took it from female clones). You WILL be able to define the sex of your plants once you move them into the flowering stage of growth. More on that in the Flowering Chapter.